ML18052B223

LER 87-021-00:on 870710,reactor Manually Tripped from 14% of Rated Power.Caused by Oil Leak from Upper Reservoir of Primary Coolant Pump P-50D.Cracked Discharge Line Associated W/Backstop Lube Oil Pump Removed & replaced.W/870810 Ltr

ML18052B223
Person / Time
Site:	Palisades
Issue date:	08/10/1987
From:	Johnson B, Lewis J CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
LER-87-021, LER-87-21, NUDOCS 8708130284
Download: ML18052B223 (4)

Text

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LICENSEE EVENT REPORT (LER)

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MANUAL REACTOR TRIP DUE TO tow LEVEL IN A' PRIMARY COOLANT PUMP UPPER OIL RESERVOIR IYINT DA Tl C&I Liiii N~llll C&I

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-- I0.71181l:lllMI I0.7:tll1CllllUI LICEN&EE CONTACT FOii THll Liiii 11:11 ID.7JC.ll2111111111 I0.7JC.ll211*1 NAME TILEPHONE NUMHlll AllllA CODI J G Lewis, Technical Director, Palisades 6 11 I 6 7 16 I 4 1 ,... 18 I 9 1 1 13 COM'LITI ONI LINI FOii IACH COWONl!NT FAILUlll DllClllllD IN THI& llll'OllT l1JI CAUH SYSTIM COMPONENT MANUFAC:. MANU,AC:.

TUlliElll TUllllll B I I I I I I No I I I I I I I I I I I I I I I I I I I I I IUPPLIMINTAL llll'Olli.T IXHCTID 11" MONTH DAY VJAlll IXPICTID n Yl!l f/f l'W. _ , . . . IXl'ICTED SIJllllSSION DATii hci NO IUIMllllON DATI 1151 I I I On July 10, 1987 at approximately 0121 the reactor was manually tripped from 14 percent of rated power due to an oil leak from the upper reservoir of primary coolant pump P~50D [AB;P].

With the Plant at approximately 70 percent of rated power, a low level alarm*

was received for primary coolant pump P-50D's upper motor oil reservoir.

Approximateiy one hour later at 0100, a three degree temperature increase was seen within the upper guide bearing of the primary coolant pump motor.

At 0112 a rapid power reduction was initiated and at 0121 the reactor was manually tripped from 14 percent of rated power to allow shutdown of the affected primary coolant pump. Actions were initiated to place the reactor in.

hot shutdown condition and P-50D was secured at 0142 in accordance with standard operating procedures.

The oil leak was initiated from a crack in the discharge line of backstop lube oil pump P-83D. The affected piping has been replaced and the three unaffected primary coolant pumps inspected. No leaks or other abnormalities were identified.

8708130284 870910

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NRC Farlft . .A 19-831 U.S. NUCLEAR REGULATORY COMMISllON LICENSEE EVENT REPORT (LER) TEXT CONTINUATION APPROVED OMB 1'.10. 3150---0104 EXPIRES: 8/31 /85

\' FACILITY NAME f11 DOCKET NUMHR (21 LEA NUM9ER 181 'AGE (31 PALISADES NUCLEAR PLANT. 0 5 0 0 0 2 5 5 8 7 - 0 2 1- 0 0 0 2 OF 0 3 TEXT llf mew_,,,. ii requirw/, - MltlifionM NltC Fonn .m.4111 1171 Description On July 10, 1987 at approximately 0121 the reactor was manually tripped from 14 percent of rated power due to an oil leak from the upper reservoir of primary coolant pump P-SOD [AB;P].

With the Plant stable and holding at approximately 70 percent of rated power to perform primary coolant system (PCS) leak rate and heat balance calculations, an alarm was received on an oil level indicator LIA-0146B

[*AB;LI]. LIA-0146B provides alarm indication for the upper oil reservoir of primary coolant pump P-50D. After receiving the alarm, Operations personnel verified no temperature increase was indicated for the primary coolant pump upper guide bearing. With only one indication that an oil leak existed, no power reduction was initiated, but increased attention was given to other

• indicators which could verify the oil leak. At 0100, LIA-0146B showed a drop in oil level from the initial alarm at 16 percent down to 10 percent.

Coincident with the further drop in oil level, a three degree F temperature increase was noted in the upper guide bearing.

At 0112 a rapid power reduction was initiated and at 0121 with the reactor at 14 percent of rated power, the reactor was manually tripped. Emergency Operating Procedure actions were initiated to place the reactor in hot shutdown condition and at 0142, primary coolant pump, P-50D was secured in accordance with Standard Operating Procedures.

Cause Of The Event The manual reactor trip was initiated following indications of an oil leak within the upper oil reservoir and upper guide bearing temperature increase for primary coolant pump, P-50D.

Subsequent investigation into the cause of the oil leak revealed a nearly circumferential crack existed within piping associated with back stop lube oil pump P-83D [AB;P]. The crack was located at the root of a thread, flush with the discharge head of the lube oil pump. The discharge head of P-83D is threaded approximately three quarters of an inch to accommodate the one-half inch I.D., Schedule 80 carbon steel discharge pipe. Failure analysis of the pipe break is ongoing.

Correction Actions The cracked discharge line associated with backstop lube oil pump, .P-83D was removed and replaced with similar Schedule 80, carbon steel pipe.

The backstop lube oil systems associated with the three unaffected primary coolant pumps were inspected. No leakage or other abnormalities were identified.

NRC Form -A U.S. NUCLEAR REGULATORY COMMISSION 19-631 LICENSEE EVENT REPORT (LER) TEXT CONTINUATION APPROVED OMB NO. 3150-0104

\' EXPIRES: 8/31185

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NUM ER NUM ER PALISADES PLANT 0 5 0 0 0 2 5 5 8 7 - 0 2 1- 0 0 0 3 OF 0 3 TEXT 11',,,,,,. - ii '9qrlited, - ~ NlfC Fonn .-.i*111171 Plant System Engineering personnel are evaluating the reliability of existing piping associated with the primary coolant pump backstop lube oil system.

Analysis Of The Event In this event the reactor protection system functioned as designed to place the reactor in a stable hot shutdown condition. Prompt operation actions in response to the backstop lube oil leak and subsequent upper guide bearing temperature increase resulted in no adverse affects to the primary coolant pump motor or other systems affecting the safe shutdown of the Plant. While the magnitude of the transient resulting from a reactor trip varies with power level, a reactor trip from full power is an analyzed occurrence which would not place the Plant in a condition which is outside of its design basis.

Therefore, no adverse safety consequences* existed.

This event is being reported per 10CFRS0.73 (a)(2)(iv) as a condition which resulted in the manual actuation of the reactor protection system.

Additional Information LIA-0146B: Upper oil reservoir level alarm indication Manufacturer: Sigma Instruments (Sl85)

Model: 9223-E30 P-83D: Primary coolant pump, backstop lube oil pump Manufacturer: . Tuthill Pump Company (T343)

Model: 26PFV

consumers Power POWERINli MICHIGAN'S PROliRESS General Offices: 1945 West Parnall Road, Jackson, Ml 49201 * (517) 788-0550 August 10, 1987 Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT -

LICENSEE EVENT REPORT 87-021 - MANUAL REACTOR TRIP DUE TO LOW LEVEL IN A PRIMARY COOLANT PUMP UPPER OIL RESERVOIR Licensee,Event Report (LER)87-021, (Manual Reactor Trip Due to Low Level in a Primary Coolant Pump Upper Oil Reservoir) is attached. This event is reportable to the NRC per 10CFR50.73(a)(2)(iv).

Brian D Johnson Staff Licensing Engineer CC Administrator, Region III, USNRC NRC Resident Inspector - Palisades Attachment OC0787-0114-NL04